Electrical distribution.



No. 880,706. I PATENTED MAR. 3, 1908. J. L. WOODBRIDGE.

ELECTRICAL DISTRIBUTION. APPLICATION FILED JAN.12,1906.

WIT ESSES: IN VEN TOR.

ATTORNEY UNITED STATES PATENT oEE oE.

' JOSEPH LESTER WOODBRIDGE, or PHILADELPHIA, PENNSYLVANIA.

ELECTRICAL ms'rnrnurron.

Specification of iiett ers Patent.

Patented March 3, 1908.

Application filed January 12. 1906- Serial ll o. 295682.

To all whom it may concern:

Be it known that I, J osEPH LESTER W001)- BRIDGE, a citizen ofthe United States and resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new. and useful lmprovements in Electrical Distribution, of which the following is a specification.

The principal object of the present invention is to provide vfor causing the transfer of energy in either direction between alter,-

nating and direct current circuits having appropriate sources and at the same time compensating for or determining the voltage characteristics of'either.

Other objects of the invention will appear 7 same shaft with the rotary armature, is an auxiliary armature whose windings are shown at D, D and D Three phase connections 1, 2, and 3, are shown between the armature winding A and the auxiliary windings D, D, and D and corresponding conductors 4, 5, and 6, connect the o posite terminals of the windings D, 1'

and D to suitable collector rings m, y, 2, which are connected by suitable brushes to the alternating current circuit 7, '8, 9.

The armature windin s D, DVand D re volve in a magnetic'iield produced by the .coils F, and these windings are so designed that an alternating electro-mot-ive force will be developed in them in phase with the electro-motive force developed at the points in the armature winding A, to which they are respectively connected by the conductors l, 2 and 3. The auxiliary electro-motive force develo ed in the windings D, D and D may be may eto oppose or assist that of the ar mature winding A by any desired amount, according to the amount and direction of the current in the field windings 'F. The fields of the rotary are shown as excited by the usual shunt field winding F and series winding F The ratio between the alternating current electro-motive force at the collector rings as, y, z and the direct current 'electro-motive force at the brushes B, may be varied in any desired amount by suitably controlling the -current in the field. windings F, F and F Thus if it is desired to intive force at the collector rings as, y, 2, without altering'the direct current electroniotive force at the brushes B, this may be accom lished by increasing the current in the fie d windings F. If on the other hand it is desired to increase .the direct current electro-motive force at the brushes B, with: out altering the alternating current electromotive force at the collector rings at, y, 2, the current in the field windings FF or F must be increased, while the current in the field windings F must, be reduced or reversed to .such an extent that the change in the electro-motive force induced in the windings D, D and D will be sulficient to neutralize the increase in the alternating current electro-motive force produced in, the armature winding A by the increase of current in the field windings If and F Arranged for connedtion to the direct'current circuit 10, 11 is shown a direct current generator G, also a storage battery H, and a consumption circuit J. Arranged for connection to the alternating current circuit 7, 8, 9, are shown an alternating current generator K, and an alternating current consumption circuit L.

Two methods of controlling the field excitacrease the alternating current electromotion produced by the windings F, are shown,

either of which may be put into operation by throwing the double pole switch S into .the proper position. When theswitchS is in the position shown in the drawing, the field wind- Ings F, are connected in series between the direct current brushes of the rotary and the direct current circuit 1O, 11. If now the direct current generator G and the storage battery H are disconnected fronrthe direct current circuit 10,11, and the consumption circuit/J is connected to said direct current circuit, and if the alternator K, is connected to the alternating current circuit 7, 8, 9, any

increase in load on the consumption circuit J will increase the current in the coils F, and

thusincrease the alternating current electro-' crease of its direct current voltage with increase of load. It now the direct current generator U remains disconnected and the consumption circuit J is also disconnected, and the battery II is connected to the direct current circuit 10, 11, and it the alternator K is disconnected and the consumption circuit his connected to the alternating current cirunit 7, b, 9, the coils F and 1 i maybe so ed that any increase of load on the alternating current circuit L will, by taking current. .lrom the battery through the rotary and through the windings F and F,produce an increase in the ratio of the alternating current eleetro-motivc force at the collector rings 3:, y, z, to the direct current-.electrm motive loree at the brushes B, sufficient to compensate tor the drop in .the battery voltage corresponding with the discharge taken from it, thus maintaining a practically constant electro-motive force on the consumption circuit L, notwithstanding the drop in the voltage of the battery 11. If now, the switch S is thrown so as to connect the field windings F with the conductors 12,- 13', and

. the switch T is closed, the second method. of

control willbe thrown into operation. This method as illustrated includes the use of carbon regulator M, which has been fully described in United States Patent. In the present instance, this carbon regulator is controlled by a solenoidX connected into the alternating current circuit 7. core or this solenoidX controls the pressure on the carbon piles of the carbon regulator M The action of the field I in the usual manner.

The soft iron coils l is thus made responsive to variations 5 of load on the alternator K, and byrproperly designing the various parts, the fluctuations f of load occurring on the consumption circuit 5 L maybe thrown ,on the direct current generator G, or the'battery H,'iustead of falling 1 on the alternator K.

It will he understood that any suitable method ol ct'introlling the current in the field coils I may he used, and I do not confine my self to the two methods oi control herein de scribed and by referring to a rotary converter a motor generator is not excluded.

In eneral, the apparatus herein described may be utilized for transferring energy in either direction between an alternating current and a direct current circuit and for controlling,suchtransfer, either automatically or otherwise, at the same time compensating for any undesirable voltage characteristic in either circuit.

By the foregoing use of words and language I do not intend to limit my invention 'urther than the prior state of the art may require, but

What I claim is r Y 1. A system of electrical distribution comprising the combination of a source of alternating current and its circuit, a. source of direct current and its circuit, transforming apparatus operatively connected between the two sources, and means responsive to fluctuations on the alternating current circuit for compelling the transfer of energy in either direction between the direct current source and the alternating current 'circtut,

said means including an armature connected I in series bctween'the alternating current terminals of the transforming apparatus and the alternating current circuit, substantially as described.

2. A system-of electrical distribution comprising the combinationof a source alternating current and its circuit, a storage hat- 7 tery and its direct current circuit, transform- 

